Cathode for electron tube

Details Cathode for electron tube Cathode for electron tube

1989-02-08

1990-05-08

DeMeo, Palmer C.

Electric lamp and discharge devices

Electrode and shield structures

Indirectly heated cathodes

313346R, H01J 114, H01J 120, H01J 1906, H01J 1914

Patent

active

049241370

ABSTRACT:
An oxide-coated cathode for an electron tube comprises a layer (2) of an electron-emissive substance. This layer (2) contains: an alkaline earth metal oxide as a principal component containing at least Ba; an oxide of Sc; and at least one heat-resisting oxide selected from the group consisting of oxides of Al, Si, Ta, V, Cr, Fe, Zr, Nb, Hf, Ta, Mo and W.

REFERENCES:
patent: 3719856 (1973-03-01), Koppius
patent: 4350920 (1982-09-01), Bertens
patent: 4797593 (1989-01-01), Saito et al.

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